diff --git a/build-constraints.yaml b/build-constraints.yaml
index 6aef32bf..a72a689b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2093,6 +2093,7 @@ packages:
     "Yoshikuni Jujo <PAF01143@nifty.ne.jp> @YoshikuniJujo":
         - zot
         - yjtools
+        - io-machine
 
     "Jan Gerlinger <git@jangerlinger.de> @JanGe":
         - irc-dcc